And on top of that, they also pay for beer - which means that you can drink as much as you want without fear of losing your wallet, and if you install a second implant with which you can also unlock the front door of your home, then you don't even have to worry about the keys 
Not too thrilled about the card in my hand but the things about the door would be interesting, if only we wouldn't have a better solution already with less hassle, and that's fingerprint, it cost 100euros and it's perfect, you can store the fingerprints, you can block them temporarily and you don't need everyone in the family to carry an implant.
I don't care if the kid will lose his keys, if someone grabs them and follows him home, and it's way more manageable.
I think implants will become rally useful when you could update the data in them easily and securly.